[archive] Support unarchive of multiple files

so we can do `unarchive *.tar.gz` for example.

Update README and compdef accordingly.

modules/archive/README.md

@@ -9,7 +9,7 @@ Functions
 ---------
 
   * `archive` generates an archive based on file extension. Syntax is `archive myarchive.tar.gz /path/to/archive`
-  * `unarchive` unarchives a file based on the extension. Syntax is `unarchive myarchive.7z`
+  * `unarchive` unarchives files based on the extensions. Syntax is `unarchive myarchive.7z`
 
 Archive formats
 ---------------

modules/archive/functions/_unarchive

@@ -1,4 +1,4 @@
 #compdef unarchive
 
 _arguments \
-  ":archive:_files -g '(#i)*.(tar|gz|tgz|bz2|tbz|tbz2|xz|txz|tlz|lzma|Z|zip|rar|7z|001)(-.)'"
+  "*:archive:_files -g '(#i)*.(tar|gz|tgz|bz|bz2|tbz|tbz2|xz|txz|tlz|lzma|Z|zip|rar|7z|001)(-.)'"

modules/archive/functions/unarchive

@@ -3,32 +3,39 @@
 # Unarchives files
 #
 
-if (( # != 1 )); then
-  print "usage: ${0} <archive_name.ext>" >&2
+if (( # < 1 )); then
+  print "usage: ${0} <archive_name.ext>..." >&2
   return 1
 fi
 
-local archive_name="${1}"
+setopt LOCAL_OPTIONS ERR_RETURN
 
 # using unpigz/pbunzip2 provides little to decompression time; the benefit is mainly in compression time.
 # setting it as an alias in the init.zsh file should be sufficient here.
 
-case "${archive_name}" in
-  (*.tar.gz|*.tgz) tar -xvzf "${archive_name}" ;;
-  (*.tar.bz|*.tar.bz2|*.tbz|*.tbz2) tar -xvjf "${archive_name}" ;;
-  (*.tar.xz|*.txz) tar -J --help &>/dev/null && tar -xvJf "${archive_name}" \
-    || xzcat "${archive_name}" | tar xvf - ;;
-  (*.tar.lzma|*.tlz) tar --lzma --help &>/dev/null && tar --lzma -xvf "${archive_name}" \
-    || lzcat "${archive_name}" | tar xvf - ;;
-  (*.tar) tar xvf "${archive_name}" ;;
-  (*.gz) gunzip "${archive_name}" ;;
-  (*.bz|*.bz2) bunzip2 "${archive_name}" ;;
-  (*.xz) unxz "${archive_name}" ;;
-  (*.lzma) unlzma "${archive_name}" ;;
-  (*.Z) uncompress "${archive_name}" ;;
-  (*.zip) unzip "${archive_name}";;
-  (*.rar) (( $+{commands[unrar]} )) && unrar x -ad "${archive_name}" \
-    || rar x -ad "${archive_name}" ;;
-  (*.7z|*.001) 7za x "${archive_name}" ;;
-  (*) print "${0}: unknown archive type: ${archive_name}" ;;
-esac
+while (( # > 0 )); do
+  local archive_name="${1}"
+  case "${archive_name}" in
+    (*.tar.gz|*.tgz) tar -xvzf "${archive_name}" ;;
+    (*.tar.bz|*.tar.bz2|*.tbz|*.tbz2) tar -xvjf "${archive_name}" ;;
+    (*.tar.xz|*.txz) tar -J --help &>/dev/null && tar -xvJf "${archive_name}" \
+      || xzcat "${archive_name}" | tar xvf - ;;
+    (*.tar.lzma|*.tlz) tar --lzma --help &>/dev/null && tar --lzma -xvf "${archive_name}" \
+      || lzcat "${archive_name}" | tar xvf - ;;
+    (*.tar) tar xvf "${archive_name}" ;;
+    (*.gz) gunzip "${archive_name}" ;;
+    (*.bz|*.bz2) bunzip2 "${archive_name}" ;;
+    (*.xz) unxz "${archive_name}" ;;
+    (*.lzma) unlzma "${archive_name}" ;;
+    (*.Z) uncompress "${archive_name}" ;;
+    (*.zip) unzip "${archive_name}";;
+    (*.rar) (( $+{commands[unrar]} )) && unrar x -ad "${archive_name}" \
+      || rar x -ad "${archive_name}" ;;
+    (*.7z|*.001) 7za x "${archive_name}" ;;
+    (*)
+      print "${0}: unknown archive type: ${archive_name}"
+      return 1
+      ;;
+  esac
+  shift
+done